The leader of Crawley council has said the authority does not support plans to build more than 10,000 homes west of Ifield.
Homes England, the government’s housing agency, wants to develop the site to include housing, schools and a relief road with work starting by 2022-23.
While the new homes would be adjacent to Crawley’s Ifield neighbourhood, the land is on Horsham council’s side of the boundary, meaning Horsham would be the decision-maker.
At a recent meeting, Crawley leader Peter Lamb said: “We do not support the application.”
However, Ken Glendinning, head of strategic land at Homes England, said: “The new neighbourhoods will create homes where they are most needed.”